碱激发镁渣胶凝特性实验设计

Experimental design of alkali activated cementitious properties of magnesium slag

该文设计了一种碱激发镁渣胶凝特性研究实验。实验涉及镁渣原材料分析、碱激发剂配制方法、碱激发剂与镁渣混合样品制备、碱激发镁渣胶凝材料的养护和性能表征测试等方面。以炼镁企业排放自冷渣为原料,采用单一和复合碱激发方式对镁渣进行处理,分析反应过程中水化产物、水化程度及影响镁渣胶凝特性的因素。结果表明,单一碱激发剂对提高镁渣胶凝活性的效果较差,养护28 d最高强度为3.0 MPa;利用水玻璃复合激发剂对镁渣激发,其胶凝活性有明显的提高,养护28d最高强度为26.1MPa。通过该实验,可使学生了解研究固废镁渣的高值化利用方法,培养学生对固废资源化高效利用的创新能力。

In this paper, an experiment study on the cementitious properties of alkali activated magnesium slag is designed. The experiments involves the analysis of raw materials of magnesium slag, preparation method of alkali activator, preparation of mixed samples of alkali activator and magnesium slag, and the maintenance and performance characterization test of alkali activated magnesium slag cementitious materials. Using magnesium slag produced by natural cooling discharged from magnesium smelting enterprises as raw material, the magnesium slag is treated by single and compound alkali activation methods. The hydration products, hydration degree and factors affecting the cementitious properties of magnesium slag during the reaction are analyzed. The results show that the single alkali activator has a poor effect on improving the cementitious activity of magnesium slag, the maximum strength is 3.0 MPa after 28 days of curing. The composite activator of sodium hydroxide and water glass has a better effect on improving the cementitious activity of magnesium slag, the maximum strength is 26.1 MPa after 28 days of curing. Through this experiment, students can understand and study the high-value utilization method of solid waste magnesium slag, and cultivate their innovative ability for efficient utilization of solid waste resources.